Hypertext Webster Gateway: "Castoreum"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Castoreum \Cas*to"re*um\, n. [L. See {Castor}.]
A peculiar bitter orange-brown substance, with strong,
penetrating odor, found in two sacs between the anus and
external genitals of the beaver; castor; -- used in medicine
as an antispasmodic, and by perfumers.
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